Crebbin, J., & Hellard, S. (2004). Apples. Cambridge University Press.
Chicago Style aipamenaCrebbin, June, and Susan Hellard. Apples. Cambridge: Cambridge University Press, 2004.
MLA aipamenaCrebbin, June, and Susan Hellard. Apples. Cambridge University Press, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.